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Fix interpolation/STRFMT overflow issues

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Widths and fractional widths greater than 255 would overflow a
uint8_t and wrap around to smaller values.

Total formatted lengths greater than the avilable buffer size
would overflow it and potentially corrupt memory.

Fixes #830
Closes #831
This commit is contained in:
Rangi
2021-04-16 22:00:17 -04:00
parent c755fa3469
commit 992be3fd9b
9 changed files with 104 additions and 15 deletions
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9
test/asm/interpolation-overflow.err Normal file
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ERROR: interpolation-overflow.asm(4):
Fractional width 99999999 too long, limiting to 255
ERROR: interpolation-overflow.asm(4):
Formatted numeric value too long
warning: interpolation-overflow.asm(4): [-Wlarge-constant]
Precision of fixed-point constant is too large
while expanding symbol "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
FATAL: interpolation-overflow.asm(4):
Macro argument '\1' not defined